Hydroxylated α-Vinylpyrrolidines from Sugar-Derived 2,5-Dihydrofurans. Synthesis of (1S,2S,8aR)-1,2-Dihydroxyindolizidine by Ring Closing Olefin Metathesis - Paolucci, Claudio; Musiani, Lorenzo; Venturelli, Francesca; Fava, Antonino (Synthesis, 1997)